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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29ed01c8ad9eeb949c2c3576ba9f36ec5cecea7a950b4ad9c4662831dc18cee2' 
  AND token = 'zzIiV8mxt5p3TcOOl8lYPeHEY6LIHjDs9kw6P5SIAzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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