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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bcf7b5903951b9800048e8f1372064dfc0182e9fd11fbc1b228534ed507179' 
  AND token = 'FalKuqHPa6iv7OlBzFfj3UulI7Rb7djbIk+cxZ78Qlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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