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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd309aef6fc76558ba8d081d476d3f2be789450ad0bf57ecac1b1a4b15cda1c0c' 
  AND token = '3ohmktLtlZG6iLjljjwYVDt0Y60nT9AHXSHMi3EUB6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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