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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686379d37a870bacc0e40ae57942841e4ea23331bba4ad22204765028b925628' 
  AND token = 'Yjr8KDBFq9RG4JC1GuR9GFH9ZWZSWH612dGsHQ2n/g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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