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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '534e02d31054fcfe5afb92123769138c5f07d130be04e5b9ff2d730a2192dda6' 
  AND token = 'm6RFZPZtocGrwZV6kUPQ2nqQQmLr2CYgJ17Wm99OFmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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