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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2496187dff1afadc51989775bd6eac75f81a04066ad5844f248a830458c62d' 
  AND token = '/wh2N/EyVR8mrzjmjkTrWp/oZ/YWIZjVJYpfOCE8F4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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