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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1153488aa38355c5ef5a0a12b6cf972b7da63362869bb03d3816cb66a97bf9e' 
  AND token = '8H1q98PUJQms65NX6lDNR7lrTs5T2ACc4ekCAp1gyDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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