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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bfc0564eabca2726cffd594c08e7a874990e6667f19ee672bd347c9f4255b7e' 
  AND token = 'ln11ROHk9lRM755Ub91y9rV0v4D+QwO3B97fTl+w+O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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