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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cc6e54855a1cad883ecdf25769b092e312ed6bcaa86d69a90628164d790a3a0' 
  AND token = '5YgaBANfCr/QQlHg2axazgFzCt2Apo5HCdRtKLeXlnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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