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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ae3a12b17fa4b5a1547b68e9950462d073b81aa5ea825ae6c1a6dcccd86c512' 
  AND token = 'gIV8skYG+vC2ZnUVn0LQcV/FaHv3tlEH+V5OCCqqkPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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