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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1def631758627972b05909e8f7919f2c65cf6920550ad4f1890df29c889998a8' 
  AND token = 'aaolLPXDt/IMtN35qh2k2Ry865sMUa7JswIlEFCYkwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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