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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '938ecac08554f26f7287a177f9fd51705a274ad95dabd7e5ec18d5c3349c58fe' 
  AND token = 'dvNdFR8Jcfufqu/cY45tdlBUYXt9a4YwpD/H/Q5qy6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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