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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8256c86e7a6ffee4e6d43558bbb733f2f4584c5e6d393ec3a431f32e6bc97db' 
  AND token = 'C5V/XaLNCZ6dAsBGTwlCFjIyZJngeIcvncQOOCVTc1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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