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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976139530bb57c9d23de3ecb51a586945554fbb4c827bfa1a5cc3fbe36f327a5' 
  AND token = 'yUeVoRYTnb0jKX/QWuFN+E1z4CtbnSyhA7tbFpynMN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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