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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a20b13d518d9f381b7e4ef846d214e022e9f065e06fc14ce23f2cc0bfd476e4' 
  AND token = 'K55TkMa2zQKhd8ZCVbnBJn75Tv4AYdP84KJlO5bl3FM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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