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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f9f6373742823af5934ec25e1620e252d21876c78c0ff50cd283439e873ced8' 
  AND token = 'F2u+lLuOjoP7W3i/Eb8iCj+fMTxXiXSV+JkF/ZSYqUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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