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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb266a73c1669d180bf8fd7689744e4e43e623adc1d9e2b2b47d6d009abb4e5b' 
  AND token = '+QhCN2iBIRyy/HcRrZx9OBZ4GJjY2+i5U0G7RkruySo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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