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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c86a11171fb535a1d770208e1f8b651fe363c1ad4dafa08346e0fef7912baa54' 
  AND token = 'IRWrtbK51hHw3Lle6pM9B7LlzxTh61yt32qxEJibSEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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