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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '066e2ed9c6c0b14cb5857e7d062a7fb5d6443ba694eb4f92540d1cac4eb568b9' 
  AND token = 'sgAhIXetb96sEChNjZJopdpND3MuMnjZgZXia9LycnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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