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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdfdacfdd4964e330c7c5b80cff3106c12883d9aa0f6e59b1ab3840f01e3b486' 
  AND token = 'r2LFDGOMVMsipIkufwzzRpEl5uH4lfH4vRr9tSZNi/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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