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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f0e3f62946732055c8a59013c001e8cd58fd96421563c51b8702ec73112daf' 
  AND token = 'ClJDNMAHur50405PRiD00O2Vcc2VAJ828aLj/9L+iMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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