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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd619e3ab3ed579dc5a4a8cd108c730f5f6be3950bf4ecfad2de2faa8daad9d78' 
  AND token = '6imOBfqyBYmF+2Zw3rjQCkxeQkI6P+tAG7AgZkQ5Ib4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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