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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07789000a3e031a25d266e0ed1d171992a209ae3707e84bd00b5bdf90f1cc795' 
  AND token = 'SdKYc4AMVl0E2VX6DGxXyDxruklsVYdRXi0ULF8sb3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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