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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b4d097e2c347e87afdb26aed084299c5f43ade2eb6ad8ab9a7d98b30257d5b' 
  AND token = '0YwPOz3NiIiomlVmMeqqQP8zlcIr/Vri83Et1yF0lk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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