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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7d06276d01dd4df006d43e1e0f1e20fd7b02ffb2bbfd35d92b1266e8bf1fa6' 
  AND token = 'r1EYnM7thDljwdMY/Heddt6zMvzRA1u5CcGW3q3UiP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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