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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55f31a81c84f57be9637ca6f6580a1bd15f964a02f29915e23e42a33c0c9f99' 
  AND token = 'psB3r/QZ3QzvQZE27v7X4Un6FAxr1vfhLauuUyZi4bg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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