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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f48ef811b06dc2935205b7d3549fefdeee2ad9a54d804f909274f8e9dc62c45a' 
  AND token = '76apLLi6HVmDtoO0lkUE6ZnQZ/O+CNyJykuBZgR5pxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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