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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '342b3318bf59a650fb035ee1e9f2bed828a91abced1a6a784936e75d87e348fa' 
  AND token = 'giRPrdk+yxKdWAl9z/yvRGfmNQH+USokLiIwNawuwQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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