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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb338da5ea87748aff412799688f50e1549cf4cf51873008fef77fa4abd2f3ff' 
  AND token = 'qS7izeNA9OPff/u38OO51e7c0fdV60HzXX54reRr7Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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