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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d296bb18276ce1ccedbec3dfe4aeacd6e1804becd6c89b4dab59aa5d4e8a98' 
  AND token = 'an4S3t72bEXWFrxaOaIevQv9x8NuPUq1US6OcNfLPss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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