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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '273671a9e751766ea2f0c0c956dd7cf43f8608fd78793c31683a2ec2bc58359e' 
  AND token = 'HuCW26yGtfLB8ojgaaRqs8wmG8GbdC6A3BITyiOUXE4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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