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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db2e6fc30b49f75aa3889a89b70bb1a4feb154c8be6fff2d33d64916939d6f2' 
  AND token = '7ie/TURgScJCsXK4vGnGe92W8V2XQi1HcG3s9S9U3PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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