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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96c4329dbedd5d9a11b4ba0f8a1c99dc82e3167cfbdea5095e8476f08f62d4cb' 
  AND token = 'HfKgV2laiyYa9Fgsnb+oDlVkNb6Fc2bLqldrm+i1dp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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