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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbff2ce4d2148625ed44a128d07ef976c371cfda7084834ee224fad00d1008a3' 
  AND token = 'W7mp6rqSj7e3Y0K+dd8LL3jFRe0f1w9hMC9mupLPs2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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