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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a75c6f1a10ec1139a29b70909c18f3bf38e230326cf2a1173e94aa5caa9622bc' 
  AND token = 'o9UZsLeJHSNXUsJrmYl2mMDxUQTgQLE6c89q/myegbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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