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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dde4cd6248496f90214b81e07a415babac121b79bf9308d67d321b8a5d873a0' 
  AND token = '0ELNAWQvx3uRlHnotl5k9FNMjnC3Z2ZQuLBReaulYAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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