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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88a4904fa0398d11c3684a8a8218046ecf8069947bdac0a2fce94b78119bb76' 
  AND token = 'Cc5dFotkXT7kfpXz6grArsWLB3zEAXsWxivuqqNkliU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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