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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a11b16e05225bb05efc35f20ba4dd4b69617cb5c11e6480bf62be26dedeb7330' 
  AND token = 'jCccJn1zJQBQnquVUTEdadcX8r3MZhR2jJ7G8qj3P3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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