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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1431dd6a307939a7f4f6370c6bc6247a994407bba84b36d124e5545ffbe4e85c' 
  AND token = 'aT9gyLjYmnI2LxC79SqvazGQ1A4VdG+yc5wkqPSTsq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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