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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2faa4f5e45c5a06cd3180e8014ad3a9a2669e5301e7abc305c6575948909ebe' 
  AND token = 'pvjU2l1RcRLb0KW5jCuGc73T2cs776MQP6BPIV78X2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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