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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7757dc1428143ffac827789667d5c20738fd344449a1d927dabdc923ebfcbbb3' 
  AND token = 'e+8kFkpibRBlqpe4gm25Z6D1ZR3/CaLF4fW82LR+NNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}