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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6921c5c7b2d9d75fcf3aa09ffd5bb47d57c99f585285a90e7b22f4b74f7d91' 
  AND token = 'VzqEd1pKqIwavwx9dokCAHPn2WnkVQLinzGCtvBBkx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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