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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbac77bcff0b81c8d73e9117c19ea9056c4e2741106744a5319ff48e7386457b' 
  AND token = 'ZGMd4gmSWUfiHAkHQ1vnDDuXGQ8Ro8V67w8epldbX50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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