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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12aae2b0f85f07cadab679b7247749c16a02bd735a037a4bafa16233539cd471' 
  AND token = 'nzNYTDfLBF0BFklrh7lRLlA4ouW3DD1opJn4K3+x2cQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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