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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d8b1e5c1d0427a0c38f5133f0b621ff82ae6ec6c8039434875f0ca439ae1d5b' 
  AND token = 'IH7uASRs/2ga6FZa4vCYt6YQcaN1sf32OKRZgbVzbuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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