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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71e2f94ee20f4f866a1be977cdbcdd0f6562199d3d03ac6f1e287f226054e2cc' 
  AND token = 'H94G+Ayw1+EdGeDGZSV+Ke2rrgccytLR15qvRMKltCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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