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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9047c78b39dce32fa6b1176dc0da9977ad7f55dfa3d608f771d40ebbd405cc' 
  AND token = 'q9xiC5uIRbq4GQJqkjtBNy0zluk6UJRJO+ecT5M4DfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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