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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8ba8bc8d2d4f11d5c4a1e69d712cf5203194a49c7f4cd7948e06392e9fa62a' 
  AND token = 'jXeO5618J6VLMULoxNI7l/75HL8PpFv6YcM4rqHe8mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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