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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6987efc86c5d46c36ec89e1446a6eabba1c3ed4790aed4f6a193673a9d2dc65' 
  AND token = 'zBcyQlORs1eU5F82ZNRrY8g44yVHol/wsaUpeeERkgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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