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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bf60cedefabef8f187a1e31182d423d9982cd458ccfa831c7e7dd8808e281cd' 
  AND token = 'fy85CFTzNnWU20zvC2KzwqjCZnzyoYPdw2NMj9Q2n5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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