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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedb574aa77efbc35db73b7897853058374d100954eafa4f68d9ca6661081f94' 
  AND token = '4d3S+ws/b8axkvuXQBhdz3wU6WkAJaNx70NncEQ5dGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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