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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6f0ce2b9917155519c10b00615b098ecf25a87dd4f7172f2da568c70a572782' 
  AND token = 'IdpMuP753eFKPJ10S8uupYQCL55tcviVVGbA5J7n1Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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