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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9c301d944d96d721808321d63b4914e6f999a2771970ae81308e2a8a9988afb' 
  AND token = 'I/034lN7OPgnH1nlcR4dOckTd9aZ8HfqujvDQ8r3qcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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