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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33495b3fe994db1445a9158f571699431edff79f815f10ae39e8c503309062f5' 
  AND token = 'zOUbA3FYxOHKVStw3Lm5PD4jbZ7x8MVfS6aPem8Bps8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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