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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b697634ee5292a66938f231b622bf4f9c62d02b16ed0827b12b3619a9a9f2e9a' 
  AND token = 'gJklUecbtRogBzKFk8ABR+zb47w+BPlGmkj2itDxVKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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