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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfbd8d4e53d6f058af5e52461186cb7238c11ca7a2fc743e7bba6e2c67b8ba8' 
  AND token = 'YSMEog8AMrJeBXjigHXnVb4b1wFEZ1AFneNJ/JoU5LA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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