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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55114864d59f23c01ded98f73d52f33ec2bfcf737c4ed98e0f7bf86c6ee43dab' 
  AND token = 'XNddsVlIiKUX80bV+5t+i3lSHZskMSk0Hm2/37iIJR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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