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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8040ebbac87cbb5718c133b577145c9f9ed0e3a145bd69b06a338a7ec79bb95b' 
  AND token = 'lmirO06LxZXuZdHO9/vmaX1VK63IK75e/VawPR4NYdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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