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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86ce3605e5932bc4da7bd250bc047cbfe4893674e423df00cc525a8dc9f8b68' 
  AND token = 'peIx/tEJuEU30M5rQQJwvJxzDeHx+uOMeXiF5EgG+SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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