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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1015602369941f7ef6372aa2b9eada4306417a82d33a03a72f3be35701eec536' 
  AND token = '8MOqpqtD9GWWt0vEfW0pbRjTFXMCuJZ4Cko6UvyxC30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00108

JSON explain

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