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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2452f520e0c14f9a144c1872b8d0babb916e0ae09bd45e4c7ae901c36464cf8' 
  AND token = '2fc5hjuSV8hiESnPYbWrf37ekcSW7EhAqm9S91WHEYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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