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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fcf736d3aaa2a56b02e6f2b52485d05554e5e9e09e54dc8357b4847cfde5b51' 
  AND token = 'rrANeYFE96HEAHmz0jDeln114M8V/Te2gCKnyZn3Ax4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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