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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25dad939fc14b7d0a01e977abb5195d04c633297f8ec9cbca0d8150f5362bcb5' 
  AND token = 'khNxpJIKanPlnsweRTCLEQjpmyDWI2BJZIL9e+kU6UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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